E 1 = -8.5 eV, E 2 = -3.9 eV, and E 3 = -2.6 eV. (c) Specify whether each of you

Question

E1 = -8.5 eV, E2 = -3.9 eV, and E3 = -2.6 eV.

(c) Specify whether each of your wavelengths in part b corresponds to ultraviolet, visible, or infrared light.

For some reasosn I keep getting the wavelength wrong. Ý»= (hc)/(E*mass of electron)

(i) (ii) (a) Ý» (nm) nm nm (b) type
of light ---Select---ultravioletvisibleinfrared ---Select---ultravioletvisibleinfrared
E1 = -8.5 eV, E2 = -3.9 eV, and E3 = -2.6 eV. Specify whether each of your wavelengths in part b corresponds to ultraviolet, visible, or infrared light. For some reasosn I keep getting the wavelength wrong. A A = (hc)/E* mass of electron) An electron with a speed of 1.7 times 106 m/s collides with an atom of element X. Shortly afterward, the atom emits a 954 nm photon. What was the electron's speed after the collision? Assume that, because the atom is so much more massive than the electron, the recoil of the atom is negligible. (Hint: The energy of the photon is not the energy transferred to the atom in the collision.)

Explanation / Answer

E = h v

E = h c/lambda

1ev = 1.6 x 10^-19 J

wavelength1 = lambda = h c/E1 = 6.626 x 10^-34 x 3 x 10^8/ (8.5 x 1.6 x 10^-19) = 1.4616 x 10^-7 = 146 nm

ultraviolet

wavelength2 = lambda = h/E1 = 6.626 x 10^-34 x 3 x 10^8/ (3.9 x 1.6 x 10^-19) = 3.1856 x 10^-7 = 318 nm

ultraviolet

wavelength2 = lambda = h/E1 = 6.626 x 10^-34 x 3 x 10^8/ (2.6 x 1.6 x 10^-19) = 4.778 x 10^-7 = 478 nm

Visible

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